Sigma-Locally Finite Family

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This entry contributed by Margherita Barile

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More things to try:

• (3+(1-sqrt(2))/(1+sqrt(2)))^(1/3)
• derivative of x^2 y+ x y^2 in the direction (1,1)
• minimize (4 - x^2 - 2y^2)^2

Cite this as:

Barile, Margherita. "Sigma-Locally Finite Family." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/Sigma-LocallyFiniteFamily.html

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